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The language barrier is usually the most difficult aspect.
Language primarily, followed by cultural.
The most difficult barrier was probably that New Mexico couldn't become a state for almost 62 years, this seems difficult because it seems like that's a very long time to try to become a state to just be denied and rejected year after year with no guarantee that your territory would every become a state.
the answer for the most common barrier is a square shaped barrier?
It would be difficult to pick between the Great Barrier Reef and Uluru/Ayers Rock.
making it trianglish
Reproach
Yes - there are people that firmly believe in curses although it seems difficult for most to understand why someone would.
If we were to ask NASA what is the most difficult part of getting a shuttle into space, I believe the answer would be, getting the appropriation through Congress.
The toccata is by far the most difficult. The prelude and sarabande would most likely translate to Masterwork Classics level ten or slightly above. The suite is much more difficult than suite Bargamasque.
I have been led to believe that Odysseus' most difficult journey was the one back home. He had to battle a cyclops, listen to beautiful voices and keep himself on the boat. That could not have been easy for him.
u locate sound by the way you make sound